Mr. Yujie Chen Profile

Yujie Chen

at Soochow Univ

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Publications (2)

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Proceedings Article | 24 November 2021 Paper

Design of lighting system for head-mounted display device

Chunlei Xing, Yujie Chen, Feng Xu, Suodong Ma

Proceedings Volume 12066, 1206610 (2021) https://doi.org/10.1117/12.2605793

KEYWORDS: Light sources and illumination, Diffusers, Relays, Light emitting diodes, Liquid crystal on silicon, Head-mounted displays, Projection systems, Collimation, Refractive index

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As a typical miniaturized smart device, the miniature projection system is an important part of a head-mounted display device. In the micro-projection system with a LCOS or a DMD as the display chip, the performance of the lighting system directly affects the final imaging quality. We design and simulate two lighting systems based on compound eyes and a diffuser respectively. The design shows that without considering the loss of polarized light the light energy utilization rate of the system based on compound eyes is 70.3% while that of the system based on a diffuser is 25%, and with the ANSI nine-point sampling method the calculated uniformity of the system based on compound eyes is 91%, while that of the system based on a diffuser is 88%, and the axial length of the lighting system based on the diffuser is 0.6 times that of the lighting system based on compound eyes. According to the analysis of design results, the compound eyes based system results in higher energy utilization and uniformity compared with a diffuser based one. Since the compound eyes based system needs a relay system, it nevertheless has a larger volume. Therefore, it is necessary to choose a suitable lighting method according to actual needs of a specific head-mounted display device.

Proceedings Article | 4 December 2020 Paper

Application of diffractive structure in micro-projection light path

Yujie Chen, Feng Xu, Penglei Zheng, Suodong Ma

Proceedings Volume 11617, 1161728 (2020) https://doi.org/10.1117/12.2585277

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In this paper, a micro-projection display with telecentric beam path in image space is designed. The device consists of a 0.26-inch liquid crystal on silicon (LCOS), a polarizing beam splitting cube and a hybrid refractive-diffractive eyepiece. The refractive-diffractive eyepiece has a focal length of 9.16 mm, a full field of view of 40° and a spectral bandwidth of 422~632 nm. The eyepiece is optimized by the wide-angle eyepiece, which consists of four optical lenses. The designed hybrid refractive-diffractive micro-projection display system has good projection effect while using a small number of lenses in a simple structure. This provides a reference for the future development of lightweight micro-projection systems.

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